<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    let xhr = new XMLHttpRequest()
    xhr.onreadystatechange = function(){
      if(xhr.readyState ===4){
        if(xhr.statis  ===200){
          console.log(xhr.response)
        }
        else{
          console.error(xhr.statusText)
        }
      }
    }
    xhr.open('GET','接口',true)
    xhr.send('213123122')
  </script>
</body>
</html>